a) y = x3 - 5x2 + 4x;
b) y = sin3x.
a) y' = (x3 - 5x2 + 4x)' = 3x2 - 10x + 4
(3x2 - 10x + 4)' = 6x - 10
b) y' = (sin3x )' = 3cos3x
(3 cos3x )' = -9sin3x
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